Abstract
Ion irradiation has been used to promote ordering processes and to modify the magnetic properties of magnetic thin films. The major reason for ion irradiation reducing the ordering temperature is the introduction of a number of vacancies. The vacancy and its influence on the ordering temperature and magnetic properties in L10 ordered FePt are investigated by first-principle simulation. The vacancy formation energy for Fe and Pt in FePt alloy are 1.45 and 2.25eV respectively. The calculated order–disorder transition temperature of Fe50Pt50 is 1680K. The order–disorder transition temperatures for Fe vacancy and Pt vacancy models are about 50K and 200K lower than that of the stoichiometric Fe50Pt50 alloy respectively. The results suggested that the vacancy in FePt alloy favors the ordering process. The saturation magnetization of stoichiometric L10 FePt is 1070 emu/cc and these of Fe and Pt vacancy are 1027 and 1075emu/cc, respectively.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
